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// Copyright 2018 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ring0
// New creates a new kernel.
//
// N.B. that constraints on KernelOpts must be satisfied.
//
// Init must have been called.
func New(opts KernelOpts) *Kernel {
k := new(Kernel)
k.init(opts)
return k
}
// NewCPU creates a new CPU associated with this Kernel.
//
// Note that execution of the new CPU must begin at Start, with constraints as
// documented. Initialization is not completed by this method alone.
//
// See also Init.
func (k *Kernel) NewCPU() *CPU {
c := new(CPU)
c.Init(k)
return c
}
// Halt halts execution.
func Halt()
// Current returns the current CPU.
//
// Its use is only legal in the KernelSyscall and KernelException contexts,
// which must all be guarded go:nosplit.
func Current() *CPU
// defaultSyscall is the default syscall hook.
//
//go:nosplit
func defaultSyscall() { Halt() }
// defaultException is the default exception hook.
//
//go:nosplit
func defaultException(Vector) { Halt() }
// Init allows the initialization of a CPU from a kernel without allocation.
// The same constraints as NewCPU apply.
//
// Init allows embedding in other objects.
func (c *CPU) Init(k *Kernel) {
c.self = c // Set self reference.
c.kernel = k // Set kernel reference.
c.init() // Perform architectural init.
// Defaults.
c.KernelSyscall = defaultSyscall
c.KernelException = defaultException
}
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